If `y=cos^(-1)(cosx),t h e n(dy)/(dx)` at x=`(5pi)/4` is equal to (a)1 (b)-1 (c)0 (d)4

If y=cos^(-1)(cosx) ,then (dy)/(dx) at x= (5pi)/4 is equal to (a)1 (b)-1 (c)0 (d)4

If y=cos^(-1)(cosx) ,then (dy)/(dx) at x= (5pi)/4 is equal to (a)1 (b)-1 (c)0 (d)4

If y = cos ^(-1) (cosx) , then (dy)/(dx) at x = (5pi)/4 is

If y=cos^(-1)(cosx),t h e n(dy)/(dx) is equal to x/y (b) y/(x^2) (x^2-y^2)/(x^2+y^2) (d) y/x

If y=cosx.cos4x.cos8x , then what is (1)/(y)(dy)/(dx) at x=(pi)/(4) equal to?

If y=e^( sinx ) the value of (dy)/(dx) at x=(pi)/(2) is , (a) 1 , (b) e , (c) 0 ,(d) not defined .

If y=tan^(-1)((sinx+cosx)/(cosx-sinx)) , then (dy)/(dx) is equal to (a) 1/2 (b) 0 (c) 1 (d) none of these

If y="sec"(tan^(-1)x),t h e n (dy)/(dx) at x=1 is (a) cos(pi/4) (b) sin(pi/2) (c) sin(pi/6) (d) cos(pi/3)

If y=|cosx|+|sinx|,t h e n(dy)/(dx)a tx=(2pi)/3 is (1-sqrt(3))/2 (b) 0 (c) 1/2(sqrt(3)-1) (d) none of these